How could you start a new global network, that isn't controlled, but, also allows large enough subnetworks to evolve to warrant using it? The idea of a decentralized network in theory works, but, if your grandma or mother can't log in to a platform to see pictures of her grandkids, why would they use it? The internet succeeded because it's tightly controlled, and ran by several major players, which makes it easy to do a few things, even if they're negative overall.
Sure, you can run your LAMP stack, and you can host your blog, websites, idea, writings, and be your own femto town-square, but the chance of that ever taking off and becoming the next Facebook, is essentially 0%. Let's assume it becomes the next Facebook, you can't control it, Facebook is a dumpster fire (along with X, Reddit, YouTube, TikTok, etc...) because at massive scale, control breaks down. You can scale for a bit with control, but you will hit a point where that platform is now is functionally uncontrollable, using reasonable moderation, and that's where we are now.
Even if we start a new global network, it will fall into the same problem over time, and I don't see how anyone can reasonably fix that, or control it.